Electromagnetic device.



R. N. HILL.

ELECTROMAGNETIC DEVICE. APPLICATION FILED 05c. I2. 1913.

1,167,067, Patented Jan. 4, 1916.

W/fnesses.

m/LM y NITED 'sTArEs PATENT OFFICE.

RALPH NADING HILL, on NEW YORK, N. Y.,' ASSIGNOR, BY 'MEsNE Assre MENrs, T0 WESTERN ELECTRIC COMPANY, iNconroEA'rEi), a CORPORATION or NEw YORK.

ELECTROMAGNETIC DEVICE.

Specification of Letters Patent.

Patented Jan. 4, 1916.

Application filed December 12, 1913. Serial No. 806,250.

One feature of this invention is the means provided for regulating and maintaining an air gap between the pole pieces and the armature which will not change even after long service and cannot be readily changed while in service.

Another feature of this invention is the meansprovided for readily and easily adjusting the tension on an armature associated with the electromagnetic device.

In accordance with these features, generally speaking, there is provided a relay having a pair of energizing coils, a substantially S-shaped armature and adjustable eccentric extensions for the pole pieces of the coils, by means of which the air gap may be changed. i

Means are carried by the armature shaft for adjusting the tension on the armature.

This invention will be more fully understood by reference to the accompanying drawings, wherein Figure 1 is a plan view of an electromagnetic device embodying this invention; Fig. 2 is a view on line 2-2 of Figfl; Fig. 3 is a view on line 3-3 of Fig. .1; Fig. 1 is a view on line 4- 1 of Fig. 2; and Fig. 5 is a view in perspective of thearmature end of the electromagnetic device shown in Fig. 1.

As shown in the drawings, the electromagnetic device or relay comprises a base 10 having secured thereto an angle bracket 11 of magnetic material and a frame 12 of non-magnetic material. The frame 12 is substantially U-shapcd, having upward extensions 13 and 14.-. The relay has two cores 15 and 16 supported by the angle bracket 11 and the extension 14 of the frame 12. Energizing windings 17 and 18 are carried by the cores 15 and 16 respectively. The cores 15 and 16 .are provided on one end NADING HILL,

attached to the armature 28 an with eccentric extensions or collars 19 and 20,

the purpose of which will be explained hereinafter.

A knurled thumb nut 25 is journaled in theextension 13 of thei'rame 12 and in an auxiliary bracket 26 mounted on said extension. A shaft 27 carrying an S-shaped armature 28 of magnetic material is journaled in the extension 1 1 of the frame 12 and in the hub of the thumb nut 25. A stop bar 29, preferably of non-magnetic material, is

tl is formed to engage one side of the pole piece extension 19 to limit the movement of the armature from the pole piece extensions 19 and 20. The ends of the armature are curved oppositely to approximate the curvature of the pole piece extensions or collars 19 and 20. Since the pole piece extensions or collars 19 and 20 are eccentric, one or both of them may be revolved to adjust the air gap between the armature 28 and said extensions. The periphery of each of the pole piece extensions or collars 19 and 20 may be enveloped with a sleeve 30 of brass or other suitablenon-magnetic material, to prevent the sticking of the'armature 28 and said pole piece extensions.

The shaft 27 has secured thereto a contact arm 35 which controls contact springs 36, 37 and 38 of a spring pile up 39 mounted on the frame 12. In Order that the armature 28 may be normally held away from the pole piece extensions 19 and 20, and in order that the tension on the armature may be readily adjusted, a spiral spring 40 encircles the hub of the thumb nut 25, the inner end of the spring engaging Outer end engaging an extension ll of the contact arm 35.

A series of terminals 12 are mounted on .taining the proper air gap, the position of the eccentric pole piece extensions "may be definitely set so that the air gap cannotv then be readily changed and will not change Ofitself, due to long use of the relay. By

said nut and the means of the armature tensioning scheme provided, it is possible to readily adjust the tension thereof to care for any leakage con ditions of theline to which the relay is connected.

What I claim is:

1. In an electromagnetic device, the combination of an electromagnet having a polar extension on the core thereof, a pivoted armature mounted adjacent one. side of said polar extension, a non-magnetic stop bar mounted on said armature and extending along the other side of said polar extension. and a spring normally holding said arma' ture away from and said 'stop bar against said polar extension.

2. In an electromagnetic device. the combination of an electromagnet having a polar extension on the core thereof, an armature pivotally mounted in operative relation to said polar extension, a spring normally holding said armature away from said polar extension whereby an air-gap is formed therebetween, and an adjustable eccentric collar encircling said polar extension for varying the air-gap between said extension and said armature including means for bold ing said collar in adjusted position.

3. In an electromagnetic device, the combination of a pair of energizing windings, cores therefor each having a polar extension, an S-sha ed armature pivotally mounted between said polar extensions, a spring normally holding said armature away from sald polar extensions whereby air gaps are formed between said armature and said polar extensions, an adjustable eccentric collar encircling each of said polar extensions tensions and said armature, means for holding said collarsvin adjusted position, and a stop bar mounted on said armature and normally held against one of said collars to control the distance at which said armature is normally held from said polar extensions.

In Witness whereof, I hereunto subscribe my name this 10th day of December A. D., 1913.

RALPH NADING HILL.

Witnesses NANON E. TUTHILL, MunRAY V. CoNA'rY.

, for varying the air gaps between said exten- SlOIlS and said armature, and means for 

